Late-Season Snowstorm Threatens Colorado and Wyoming with Up to 30 Inches

Heavy Snow Warning in Colorado, Wyoming as 30 Inches To Hit: 'Hazardous' – Image for illustrative purposes only (Image credits: Unsplash)

Colorado and Wyoming – The National Weather Service issued urgent warnings for a late-season winter storm barreling toward the Rockies, where isolated areas could see up to 30 inches of heavy snow.[1] This system, unusual for early May, promises widespread accumulations that forecasters say will complicate travel and strain power infrastructure across mountain passes and interstates.[2] Residents and visitors in the region prepared for disruptions as the storm intensified late Monday.[3]

Storm Tracks Across the Central Rockies

The system originated as a cold front pushing through the Northern Rockies before stalling over Colorado and southeastern Wyoming. Forecasters tracked its progression from Sunday, with impacts beginning late Monday, May 4, and continuing through Wednesday morning, May 6.[3] Highest threats centered near the state line, where snow bands formed rapidly along key corridors like Interstate 25.

National Weather Service offices in Denver, Cheyenne, and Riverton coordinated alerts, upgrading watches to full winter storm warnings as moisture surged into the region. Southeastern Wyoming counties faced the brunt early, with spillover into northern and central Colorado. The Sierra Madre Range joined the advisory zones as conditions worsened overnight.[4]

Snowfall Estimates Reach Extreme Levels

Projections called for 12 to 24 inches across most warned areas, but higher terrain promised more. Isolated spots in Boulder’s higher mountains stood to receive up to 30 inches, according to the Denver office.[1] Wet, dense snow characterized the event, amplifying weight on trees and lines.

Winds gusting to 45 mph accompanied the flakes, reducing visibility and piling drifts in open areas.[5] While lower elevations saw lighter totals of 6 to 12 inches, passes like those in Rocky Mountain National Park entered the highest risk category. This late dump offered some relief for snowpack amid dry conditions earlier in the season.

Travel Becomes Primary Concern

Officials emphasized hazardous road conditions as the top threat. Major routes including I-25 from Cheyenne to Denver, I-70 through the Eisenhower Tunnel, and I-80 across Wyoming snowbanded heavily at times.[6] The service advised delaying nonessential trips, with mountain passes at risk of closure.

Airports in Denver and Cheyenne monitored for delays, though flights remained on schedule early Tuesday. For regional drivers from the Southwest, this storm disrupted popular spring routes toward ski areas still open at higher elevations. Chains or winter tires became mandatory in affected zones, and plows mobilized ahead of peak accumulations.

• Southeastern Wyoming near Colorado border: Highest road impacts expected.
• Northern/central Colorado mountains: 20+ inches likely.
• Rocky Mountain National Park: Full closures possible.
• I-80 in Wyoming: Heavy snow bands developing.

Power Outages and Secondary Hazards

Heavy, wet snow posed risks to power lines, with downing expected in forested foothills. Past similar events downed poles under accumulated weight, and forecasters anticipated scattered outages through midweek.[7] Utilities prepositioned crews along vulnerable stretches.

Beyond electricity, the storm brought colder temperatures dipping into the 20s and 30s, with rain-snow mixes at lower spots. Flooding remained low risk given the season, but rapid melt later could swell streams. Emergency managers urged checking vehicles and home preparedness kits.

What Lies Ahead for the Rockies

As the storm peaked Tuesday, May 5, clearing skies followed by Thursday, allowing cleanup. This event underscored the Rockies’ unpredictable spring weather, blending beneficial moisture with logistical headaches. Travelers heeded calls to monitor updates from local NWS offices, ensuring safer passage once roads reopened.

Though disruptive, the snow bolstered water supplies for summer, a silver lining in an otherwise challenging forecast. Regional authorities stayed vigilant, ready for any escalation in impacts.